Time-limit relay.



A.- B. REYNDERS.

TIME LIMIT RELAY;

ADPLIOATION FILED 0013.20,19o4.

2 SHEETS-SHEET 1.

A. B. BJEYNDERSa TIME LIMIT RELAY;

APPLICATION FILED 001:. 20, 1904.

' 995,184; Patented June13,1911

2 SHEETS-SHEET 2 WITN l4 flaw/Jaw 4 ARTHUR B. REYNDERS, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WESTING- HOUSE ELECTRIC & VANIA.

MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- TIME-LIMIT RELAY.

Specification of Letters Patent. Patented June 13 1911,

Application filed October 20, 1904. Serial No. 229,349.

vented a new and useful Improvement in Time-Limit Relays, of which the following is a specification.

My invention relates to time limit devices which-are interposed between main circuits and the tripping coils of automatic breakers for such circuits in order to avoid operation of the breakers by reason of momentary ourrent fluctuations.

My invention has for its object to provide a device of the character indicated which shall have a time period between the beginning of a flow of current that exceeds a predetermined amount and the instant when the circuit-breaker is tripped that is inversely proportional to the amount by which the vcurrent exceeds the predetermined amount.

My invention is illustrated in the accompanying drawings, in which- Figure 1 is aview, in side elevation, of a device constructed in accordance therewith, the casing for the device being shown in section. Fig. 2 is an enlarged view, partially inelevation and partially in section,

.ofsome of .the parts shown in Fig. 1. Fig.

3 is a view, in front elevation, of the device shown in Fig. 1, and Figs. 4 and 5 illustrate diagrammatically the circuit connections of the time limit relay comprising my invention.

Supported by a suitable framework 1, within a casing 2, are magnet coils? and 4, which are respectively providedwith movable iron cores or armatures 5 and.6 and are connectedto an external circuit by means of leads (1. Each of the cores or armatur'es carries a guide stem 7, t0 the lower end of which is attached a contact terminal 8 in the form of a conducting plate or disk. A

plurality of disks 9 having slots 9 'of such width as to receive either of the stems 7 are provided for the purpose of adjusting the weights to be lifted by the magnet windings. I

When not in use, the disks 9 may besupported upon apin 9 as indicatedinFigs. i and 3.

Secured to an insulating block 10, a recontact strips 11, which are adapted to be engaged by the conducting disks 8 when the armatures 5 and 6 are raised. The lengthof the path of movement of the conducting disks 8 may be varied by raising or lowering the block 10 and its strips 11 by means of a screw 12 which is threaded into the free end of the bracket-arm 13 andengages the under side of the block 10, the head 14 of the screw and alock-nut 15 being located on the exterior of the casin 2. Guide rods 16, having their lower en s rigidly secured. to the block- 10 and their upper ends projecting through holes in a bracketarm 17 of the framework 2, serve'to maintain the contact strips 11 rigidly in the position to which they may be adjusted by means of the screw 12.

The upper sides 18 of bellows 19 and 20 are rigidly secured to the portion 21 of the framework 1, by means of suitable brackets 22, and are provided with outlet valves 23, each of which comprises a ball 24 thatis normally held toits seat 25 in a suitable tap plug 26 by'means ofta spring 27. The plug 26 is provided with an adjustable, perforated nut 28 for -adjusting the pressure which the spring 27 exerts upon the ball 24.

-The lower sides'29 of the bellows are hinged 'vided for the purpose of counterbalancing or partially counterbalancing the weights of the lower sides of the bellows. Rods 38 are rigidly secured to the portion 21 of the framework 1 and their projecting free portions are provided with nuts 39 that are adjustable in position thereon. Springs 40 have their respective ends secured to the adjustable nuts 37 and 39. The lower sides of the bellows .19 and 20 are also connected with the magnet cores 5 and 6, respectively, by means of rods 4'0 sothat when the cores are raised, as a result of the energizing of the magnet windings 3 and 4, the raising of themagnet cores may be retarded. As the cores5 and 6 are drawn into the coils 3 and 4, a better magnetic circuit is established and the, pull upon the cores increases. In order thatthe motions of the cores maybe'uniform and also in order that the time'period required to bring the conducting disks 8 into engagement with the contact strips 11 may be substantially inversely proportional to the current in the magnet windings 3 and 2-, it is necessary to provide means for neuwith a. single-phase circuit of a. single pair of magnet windings such as appear in the foregoing figures, it of course being understood that while the device shown in the previous figures is for use in connection with either two or three phase circuits, it may be modified, without affecting the scope of my invention, for employment in connection with single-phase circuits or circuits of any other number of phases. As here shown, the magnet coils 4 are supplied with energy from the secondary winding 41 of a series transformer 42. The conducting disk 8 is brought into engagement with the contact strips 11 when more than a predetermined amount of current is supplied continuously over the main circuit conductor 43, thereby completing a battery circuit to the tripping magnet winding 44 of a circuit-breaker 15.

In Fig. 5, a modification of the circuit conneetions of Fig. 4c is shown, in which the energy for tripping the circuit-breaker is derived from the main circuit. Magnet windings 4 are connected in series with the secondary winding {ll of a series transformer 42, and under ordinary conditions, a circuit is completed through a finger d6 and a terminal 47. When more than a predetermined amount of current is supplied continuously through the circuit conductor 4:3, the raising of the magnet core causes the finger 4:6 to disengage the terminal 47, the circuit-breaker tripping coil 44 being then energized.

I claim as my invention:

1. The combination with a magnet winding and a movable core therefor, of a bellows having a movableside connected to said core, arms carried by the movable side oi said bellows upon which an adjustable counterweight and an adjustable nut are respco tively mounted, astationary arm, an adjustable nut carried thereby, and a spring connected between said nuts.

2 'The combinationwith a magnet winding and a movable core therefor, of contact terminals carried by said core, stationary contact terminals, a bellows having a movable side connected to said core, arms carried by the movable side of said bellows upon which an adjustable counterweight and an adjustable nut are respectively mounted, a station ary arm, an adjustable nut carried thereby, and a spring connected between said nuts.

3. The combination with a magnet winding and a movable core or armature therefor, of a bellows connected to said movable core-or armature and having one side provided with an inlet valve and its other side provided with an escape valve, each of said valves being automatically opened and closed. 7

4. T he combination with a magnet winding and a movable core, or armature therefor, of a bellows having automatic inlet and escape valves in its respective sides and connected to said core for retarding the movement thereof, and a spring for causing the movement of the core or armature to be substantially uniform.

.5; The combination with a magnet winding and a movable core or armature therefor, of a bellows having a hinge-supported side connected to said core or armature and pro vided with laterally projecting arms, a counterbalancing weight upon one of said arms. and a spring opposing movement the other arm and adjustable longitudinally thereof to vary the leverage exerted by said core or armature.

(S. The combination with a magnet wind ing and a movable core or armature there-for, of a bellowsdlaving automatic inlet and escape valves in its respective sides and connected to said core or armature for re tarding the movement thereof, and a spring the tension upon which 'aries substantially as the magnetic pull upon the said core or armature varies.

7. The combination with a magnet winding and a movable core 'or armature therefor, of a bellows having a hinge-supported side to which said core or armature is connected, means for eounterbalancing the weight of said hinge-supported side, and a spring acting in opposition to the pull exerted by said magnet winding and laterally adjustable with reference to the hinge in order,to vary the degree of opposition to said pull.

In testimony whereof, I have hereunto subscribed my name this 18th day of Octo ber, L904. 1

ARTHUR B. REYNDERS. lVitnesses:

BIRNEY HINns,

C. A. I'IEPP. 

